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    • 78. 发明公开
    • SWITCHING POWER SUPPLY AND TELEVISION
    • EP3471512A1
    • 2019-04-17
    • EP17847872.3
    • 2017-01-05
    • Shenzhen Skyworth-RGB Electronic Co., Ltd.
    • CHEN, JianzhongYANG, Jitao
    • H05B33/08H04N5/63
    • The present disclosure discloses a switching power supply and a television. The switching power supply includes a constant-current switch circuit, a first single stage PFC circuit, a first transformer, a constant-current feedback circuit, a constant-voltage switch circuit, a second single stage PFC circuit and a second transformer; the constant-current feedback circuit samples a current outputted by the first transformer, and feeds back the sampled current to the first single stage PFC circuit; the first single stage PFC circuit outputs a switch signal, and drive the constant-current switch circuit to be turned on or off, so as to control a load current to be constant according to the sampled current; the second single stage PFC circuit outputs a switch signal and drive the constant-current switch circuit to be turned on or off; the second single stage PFC circuit samples a voltage outputted by the second transformer to obtain a sampled voltage, and regulates the duty ratio of the switch signal according to the sampled voltage, to regulate the voltage output to a main board, so that to control the voltage of the load to be constant. The solution of the present disclosure improves the power conversion efficiency and stability, and reduces the cost.